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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba329b1057304178249e6a5e78e2d86d32b65ab05c3f0eba2da551bf24d5be7b' 
  AND token = 'JSP2zCtpcO+JzEjme6vvkCcuCtmpS11fm01mLB0gfiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}